Attaching an undermount sink emoticon - undermount sinkto Granite/Quartz countertops is no easy feat. One wrong move and that beautiful slab of stone turns into an expensive pile of rubble. Yikes! Thankfully, with the the best adhesive for undermount sink to granite, you can avoid a granite-astrophe and securely stick that sink where it belongs.

Best Adhesive for Undermount Sink to Granite
We’re about to dive into the world of sticky stuff and explore the best option for this particular task.

In this ultimate sticky guide, we’ll clue you in on the best glue for the job. And no, Elmer’s won’t cut it for this project (sorry kids). We’re talking industrial-strength adhesives that form an unbreakable bond between sink and stone.

Gorilla Waterproof Caulk – Strongest Adhesive for Undermount Sink

Gorilla Waterproof Caulk
I usually stick to GE caulks for my jobs, but I thought I would give Gorilla a try. The product was ready to apply and seemed to work well, and so far, there have been no water leakages.
Product OverviewThe Gorilla Waterproof Caulk & Seal is a 100% silicone sealant, designed to keep water, air, and moisture at bay.

It’s perfect for a multitude of uses – from kitchens to baths, windows, doors, and even marine applications. What sets this sealant apart is its resistance to mold, mildew, and its ability to maintain integrity without yellowing, shrinking, or cracking over time.
Pros and ConsPros
Waterproof and mold & mildew resistant
Clear formulation that won’t yellow, shrink, or crack
Ready for water exposure in 30 minutes

May require careful application to avoid messiness
Might not be suitable for all surfaces
In-Depth AnalysisThis sealant is a powerhouse when it comes to durability and versatility.

With its high tensile strength of 7.75 MPa, it can withstand extreme temperatures up to 600° F or 315° C.

It’s resilient, flexible, and bonds effectively to most surfaces.

When used in combination with epoxy and mechanical support, it forms a formidable adhesive for undermount sinks to granite.
Real-Life ExperienceHaving used this sealant for my own undermount sink installation, I was impressed by its ease of use and immediate bond.

It dried clear and has held up well, despite frequent use and high moisture exposure. It truly stood up to its name – Gorilla Strong!
Testimonials and ReviewsOn, user “DIYDiva” noted, “This stuff is no monkey business! Used it for my kitchen sink and it’s held up wonderfully.”

On, “HomeRenoMaster” said, “The best sealant I’ve ever used. It dries quickly and holds strong.”
Price and ValueWhile the Gorilla Waterproof Caulk & Seal is priced higher than some competitors, its superior performance and durability justify the cost.

Given its numerous applications and the peace of mind it provides, it definitely offers great value for money.
ConclusionGorilla Waterproof Caulk & Seal 100% Silicone Sealant proves to be a robust, reliable, and versatile adhesive solution. Its fast-drying and waterproof properties, coupled with its clear and durable finish, make it a top choice for undermount sink installations.
Gorilla Waterproof Caulk & Seal 100% Silicone

How to Use Gorilla Waterproof Caulk for Stainless Steel Kitchen Sink

I received an email from Anne asking about the detailed process. In case you met the situation, I’m sharing our conversation here.

an email about Stainless Steel Kitchen Sink

Current situation:

current situation of Anne's Under-mount kitchen sink

Hi Ronald,

I left a question on your website but not sure how often you look at those. My stainless steel kitchen sink dropped away from my quartz countertop and I’m going to attempt to fix it myself. I ordered some sink clips from Amazon and some cabinet jacks and I’ve been scouring your website for the best adhesive. I noticed in one article you said the gorilla waterproof caulk and seal 100% silicone is the best but then I also noticed you mentioned it in a different article to use in combination with epoxy. I really don’t want to mess this up – please help me lol. The clips I bought also need to be glued as I didn’t want to mess around with drilling into my countertop, with my luck it wouldn’t end well. 

My Reply:

Hi Anne! I’m glad you reached out about the best adhesive to use for re-attaching your stainless steel sink. I would recommend using a combination of Gorilla Adhesive and a two-part epoxy adhesive. 

The Gorilla adhesive will provide a super strong and waterproof bond between the sink and countertop. Make sure to apply it liberally to both surfaces. The epoxy is great for filling any gaps between the sink and countertop and helping create an even stronger bond when used with the Gorilla adhesive. 

For the sink clips, I would again recommend using Gorilla adhesive to attach them. Just make sure the surface is clean before applying the adhesive. Gorilla glue is incredibly versatile and strong for household projects like this.

Anne’s Reply:

Ok so for the gorilla adhesive, I should be using the gorilla caulk and seal, using it to stick the sink and countertop together. Then I run the two part epoxy along the seam to keep the water out of the gap? 

Thank you for all your help!

Sent from my iPhone

Best Silicone Adhesive for Vanity Top – DAP 100% Silicone Waterproof Sealant

I was pleasantly surprised by this adhesive. I was worried it would have a strong odor that would linger, but that wasn’t the case at all. I used it to attach an undermount sink to a granite countertop in my kitchen remodel, and the adhesive had barely any scent. This was a huge relief for me.


I found the adhesive dried quickly once applied, which was perfect for my project. I was able to get the sink securely mounted without having to wait overnight for it to set. The adhesive squeezed out of the tube smoothly and evenly. It was easy to work with and get an even application under the sink.

use DAP 100% Silicone Waterproof Sealant around the sink

Once dried, the adhesive seems extremely durable. I can’t see any indication that it won’t hold up well over time. The sink feels completely secured. I’m confident this adhesive will keep my sink mounted properly for years to come.


The one minor downside was that it did take a bit longer than expected for the odor to fully dissipate. I used it in my kitchen with the windows open for ventilation. There was a faint chemical smell for the first day or two after application. It wasn’t overpowering but I did notice it. After a couple of days, I couldn’t detect any odor at all. A small price to pay for such an effective adhesive.

DAP 08649 Silicone 100 Percent Silicone
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Loctite Epoxy Metal/Concrete – Best Adhesive for Stainless Steel Sink to Granite

Loctite Epoxy Metal/Concrete
When choosing an adhesive for attaching a stainless steel sink to a granite countertop, several key requirements should be considered. First and foremost, the adhesive must provide a strong and reliable bond between the sink and the countertop, capable of withstanding the weight of the sink and any associated pressures. It should be specifically designed for bonding stainless steel to porous surfaces like granite, ensuring optimal adhesion on both materials.

I recently upgraded from my old stainless steel kitchen sink to a new granite sink. A key step was selecting the right adhesive to attach the new granite sink to the countertop. But feel free to see my article best adhesive for stainless steel.

After removing the old sink, I thoroughly cleaned the countertop. I wanted a spotless surface for the adhesive to bond to.

I chose Loctite’s two-part epoxy after reading positive reviews. Mixing it was a bit tricky – the adhesive was extremely thick and hard to squeeze out of the tubes. I had to cut the tips wide open.

reattch undermount sink
Once mixed on a cardboard sheet, the epoxy spread smoothly on the sink and countertop. I appreciated the long working time to get the sink aligned just right before the adhesive hardened.

The Loctite epoxy bonded incredibly strong. I could tell the granite sink was completely secured after just a few hours of curing. The bond has held tight even with heavy use of the sink day after day.

While the application was messy and difficult, the adhesive’s performance has been outstanding. No leaks or separation despite constant water exposure.

Loctite Epoxy Metal/Concrete

For such an important application – permanently adhering to a heavy sink – I’m glad I chose this extra-strength epoxy. The tubes may have been hard to dispense, but it was worth it for the leak-proof bond.

DAP AMP Kitchen/Bath White Adhesive Caulk – Best Adhesive for Undermount Sink to Quartz

DAP AMP Advanced Modified Polymer
I chose DAP AMP because I was replacing caulk from multiple mold-infested spots, and this was recommended as the most advanced new mold-resistant product on the market.
It works perfectly for natural stone and granite, and it will be great for your under-mount sink.

Here are some tips for using it:

5 tips for DAP AMP Adhesive Caulk
  • Tip 1: Use the correct type of adhesive
  • Tip 2: Use an exacto knife to cut the tip at an angle
  • Tip 3: Mark the longer side of that angle with a marker, then puncture the tube and load in the gun
  • Tip 4: Wrap the tip of the tube with plastic wrap and a tuber band

You might also be interested in Dap AMP Vs. DAP Silicone

DAP AMP Advanced Modified Polymer

GE Sealants Undermount Sink Adhesive For Granite

GE Sealants & Adhesives M90006 Supreme Silicone Kitchen & Bath Sealant, 10.1oz, Clear

GE Sealants & Adhesives M90006 Supreme Silicone Kitchen & Bath Sealant
Product OverviewGE Sealants Undermount Sink Adhesive for Granite is a transparent adhesive that forms a durable bond between your sink and granite countertop.

Its primary purpose is to securely install undermount sinks, making sure they withstand everyday use.

This adhesive is perfect for those looking to install or repair an undermount sink in their home.
Pros and ConsPros
Strong bond with granite countertops
Transparent, maintaining the aesthetics of your kitchen
Suitable for everyday use

May not be as flexible as some other types of sealants
In-Depth AnalysisThis adhesive’s design is specifically tailored for granite undermount sinks, ensuring a secure installation. The transparent nature of the adhesive won’t interfere with the appearance of your sink or countertop.

While it may not be as flexible as other types of sealants, its bonding power is unmatched for this particular use case.
Real-Life ExperienceAfter using GE Sealants Undermount Sink Adhesive for Granite, my sink remained firmly in place without any signs of weakening.

The application process was straightforward, and the adhesive didn’t leave any visible residue or marks on my countertop.

I was impressed with its performance, especially compared to other adhesives I’ve tried in the past.
Testimonials and ReviewsOne user, KitchenQueen98, mentioned on Amazon, “This adhesive saved my sink! After trying several other products, the GE Sealants Undermount Sink Adhesive did the trick. My sink hasn’t budged since I applied it.”

Another user, DIYDad27, said, “I used this adhesive for a recent undermount sink installation, and it worked like a charm. No more wobbling or sagging.”
Price and ValueThe price of GE Sealants Undermount Sink Adhesive for Granite is reasonable compared to other adhesives on the market.

While it may not be the cheapest option, its performance, durability, and compatibility with granite countertops make it well worth the investment.
ConclusionGE Sealants Undermount Sink Adhesive for Granite is a reliable and effective solution for securing your undermount sink to your granite countertop. It provides a strong bond, ensuring your sink stays put, making it worth the investment.

While it may not be as flexible as other types of sealants, its bonding power is specifically designed for granite undermount sinks, and the results speak for themselves.

If you’re tired of dealing with a wobbly or detached undermount sink, give GE Sealants Undermount Sink Adhesive for Granite a try. Here is another glue that dries to the touch quickly and is waterproof, then the Permatex Undermount Sink Glue is a good choice.👇👇👇

Permatex Undermount Sink Glue

Permatex 81158 Black Silicone Adhesive Sealant, 3 oz. Tube, Pack of 1

Permatex 81158 Black Silicone Adhesive
Product OverviewPermatex Undermount Sink Glue is a premium adhesive designed to provide a robust bond between your undermount sink and granite countertop.

Its purpose is to ensure secure installation and longevity. This is a go-to product for those who want a permanent solution to their undermount sink problems.
Pros and ConsPros
Durable and robust bonding
Suitable for granite countertops
High heat resistance
May take longer to dry than some other adhesives
In-Depth AnalysisThe Permatex Undermount Sink Glue is specifically designed to work with granite countertops. This adhesive has a high heat resistance, meaning it won’t weaken even in warmer climates or under hot water.

While it may take a bit longer to dry compared to some other adhesives, the strong and durable bond it forms is worth the wait.
Real-Life ExperienceI used Permatex Undermount Sink Glue to fix my own undermount sink, and I was amazed by the results.

The bond it created was extremely durable, and even after several months of heavy usage, there were no signs of weakening.

The longer drying time did require a bit of patience, but the outcome was definitely worth it.
Testimonials and ReviewsGraniteMaster101, a user on Walmart, raved, “Permatex Undermount Sink Glue has saved my kitchen sink! The bond is solid, and it’s held up for months now without any issue.”

Over on Etsy, HomeRenovator45 said, “Installed a new sink with this glue, and it’s been rock solid. Great product!”
Price and ValuePermatex Undermount Sink Glue is priced competitively when compared to other adhesives in the market.

Given its high heat resistance and the strong bond it forms, it definitely offers excellent value for money.
ConclusionIf you’re struggling with an undermount sink and granite countertop duo, the Permatex Undermount Sink Glue is an outstanding solution. Its strong, resilient bond and high heat resistance ensure that your sink stays put. While the drying time may be a tad longer, the results are definitely worth the wait.

Sinkin’ About Best Undermount Sink Adhesive

Undermount Sinks
Undermount sinks come in various materials, like stainless steel, cast iron, solid surface, and copper, which can make them the perfect addition to your kitchen.

They’re called “undermount” because they’re mounted beneath the countertop, unlike those other sinks that just drop into a pre-cut hole.

Let’s dive deeper into the fascinating world of undermount sinks and explore their structure, features, and the necessity of attaching them to countertops, especially granite countertops.

Structure of Undermount Sinks

The structure of undermount sinks is designed to provide a seamless and sleek look in your kitchen. Instead of having a lip or rim that sits on the countertop, undermount sinks have a flat edge that attaches directly underneath the countertop. This design creates a smooth transition from countertop to sink, making it both visually appealing and functional.

The undermount sink emoticon - undermount sinkis supported by mounting hardware, such as brackets or clips, which are hidden from view. This mounting system ensures that the sink stays securely in place while maintaining its sleek appearance.

Features of Undermount Sinks

Seamless Look: Undermount sinks create a clean, continuous look between the countertop and the sink, making your kitchen appear more modern and streamlined. Say goodbye to unsightly sink rims!

Easier to Clean: With no lip or rim to collect debris, undermount sinks are much easier to clean. Just wipe crumbs and spills directly into the sink – no more trapped gunk on the countertop edge!

Customizable: Undermount sinks come in a wide variety of materials, shapes, and sizes, allowing you to find the perfect sink to match your kitchen’s design and your personal style. Whether you’re into the industrial look of stainless steel or the timeless elegance of cast iron, there’s an undermount sink for you.

A Rock-Solid Love Affair: Granite Countertops

Granite Countertops
Granite is Mother Earth’s gift to countertops. Extracted from the ground, these huge blocks of granite are sliced, diced, and polished to reveal the true beauty of natural stone.

Known for being durable and acid-resistant, granite is less likely to scratch or discolor than softer stones, like marble or soapstone. But hey, nobody’s perfect, so it’s not entirely stain-proof.

The Necessity of Attaching Undermount Sinks to Countertops

Attaching undermount sinks to countertops, especially granite countertops, is essential for several reasons:

Support: Granite countertops are heavy, and they need proper support to hold the weight of the sink. The mounting hardware and adhesive ensure that the sink stays in place and can bear the weight of pots, pans, and other kitchen items.

Water Resistance: Properly attaching an undermount sink to a granite countertop helps create a watertight seal, preventing water from seeping into the cabinets below. This is especially important in a kitchen where water usage is frequent.

Aesthetics: A well-attached undermount sink adds to the overall beauty and functionality of your kitchen. A poorly attached sink not only looks bad but can also be a safety hazard.

In conclusion, undermount sinks bring a touch of modernity and sophistication to your kitchen, but they need to be properly installed and attached to countertops, especially granite ones. By doing so, you’ll enjoy a seamless, easy-to-clean, and durable sink that makes your kitchen stand out!

What Is the Best Adhesive for Undermount Sink to Granite – Silicone Sealant

With so many types of sinks and countertops out there, you might still be wondering “what is the best adhesive for undermount sink to granite?”

But fear not, for silicone sealant is here to save the day!

It’s the adhesive of choice for attaching an undermount sink to a granite countertop because it holds the two materials together even when they’re regularly exposed to water. After all, who wants a soggy sink?

When it comes to undermount sinks, you need a glue that can bear the sink’s weight and create a strong, watertight seal. That’s where 100% silicone sealant comes in. It’s flexible, robust, and the go-to choice of most undermount sink manufacturers. Remember, only 100% silicone will do, or you’ll find yourself knee-deep in sink trouble.

Tools of the Trade: Installing Your Undermount Sink to Granite

Before you dive into the installation process, make sure you’ve got all the tools you need. Here’s a handy-dandy list to help you out:

  1. Undermount Sink with Mounting Hardware
    Measure your granite countertop to choose the right sink, and don’t forget the mounting hardware kits and clips.
  2. Silicone Sealant
    This is the adhesive superhero we’ve been raving about!
  3. Clamps
    You’ll need these bad boys to help position the sink just right.
  4. Power drill
    To drill holes for the clips and secure the sink.
  5. Screwdriver
    A must-have to tighten the sink’s clips and installation kits.
  6. 2×4 Lumber Board
    Works with a bar clamp for added support.
  7. Sandpaper
    Smooth out any rough spots on your granite countertop.

Frequently Asked Sticky Questions

What adhesive is used for undermount sink to quartz?

Silicone caulk is the go-to adhesive for attaching undermount sinks to quartz countertops. One time, I tried using a different adhesive for a quartz countertop, and let me tell you, it wasn’t pretty. The sink was wobbly, and I had to redo the whole thing. Since then, I’ve been a die-hard silicone fan.

Can you install an undermount sink without clips?

Most undermount sinks come with clips, but many installations don’t require them. The silicone sealant and proper support are usually enough to hold the sink in place. I’ve done a few installations without clips, and they’ve held up just fine. But if you’re a fan of extra security (like me when I’m binge-watching a scary movie), go ahead and use those clips!

Will silicone hold a sink in place?

You bet it will! Silicone sealant is the industry standard for kitchen sink installation, especially for attaching undermount sinks to granite countertops. I’ve seen silicone hold up sinks in even the busiest of kitchens – it’s like the superhero of adhesives!

What is the best sealant for undermount sink installation?

100% silicone sealant is the top choice for undermount sink installation, as recommended by most manufacturers. In my adhesive adventures, I’ve tried various sealants, but nothing compares to the sticking power of 100% silicone. Trust me; it’s like the difference between store-brand cola and the real deal – one just doesn’t measure up!

What happens if you use the wrong adhesive for an undermount sink?

Using the wrong adhesive for an undermount sink can lead to a world of problems. I once used a non-silicone adhesive for a friend’s sink installation, and it wasn’t long before the sink began to sag and even leak. It was an embarrassing and costly mistake that I learned from. So, always stick to 100% silicone sealant for a secure and long-lasting installation!

Can I use epoxy instead of silicone for an undermount sink installation?

While epoxy might seem like a tempting alternative, I’d advise against it. Although epoxy is strong and durable, it’s not flexible like silicone, which is crucial for a good undermount sink installation. With my years of experience, I’ve found that silicone provides the perfect balance of strength and flexibility for the job. Trust me, stick to silicone, and you won’t be disappointed.

How long should I wait for the silicone to cure before using the sink?

Ah, patience is a virtue! In my sticky adventures, I’ve learned that you should wait at least 24 hours for the silicone to cure fully. Giving it enough time to cure ensures a strong, watertight bond between the sink and the countertop. It might be a little tough waiting, but it’s worth it in the end!

The Sticky Conclusion

An engineer is holding an adhesive
There you have it, folks! 100% pure silicone sealant is the ultimate adhesive for installing an undermount sink to a granite countertop.

Using anything less than the best might leave you with a sinking feeling, so don’t skimp on the silicone.

Did you enjoy this glue-tastic adventure? Have any questions or sticky stories to share? Drop a comment below, and let’s keep the adhesive conversation going!

I’m Ronald Stevens, a Mechanical Engineer obsessed with adhesives, glue, and all things sticky! My passion began in childhood when I’d always be the one playing with glue during arts and crafts. I’d beg my parents to buy me the biggest bottle of glue possible, and I’d spend hours researching and experimenting with different types. Happy reading, and remember: stick with the best, and you’ll never be stuck in a mess!